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first the pump may not be able to reach the 50 psi to turn it off running at 8 gpm. What I mean is if you turn on your 8 gpm zone the pressure will drop to 40 then the pump will kick on. At this point it will work its way back up to 50 psi but it may never reach that point. It may lvel out at 47 psi and run at that pressure.